Why are they protesting now still?
HK won a great victory in June, when (estimated) 2 million people took to the streets to oppose the HK Government's proposed "Extradition Bill." The HK Chief Executive soon declared the bill 'dead.'
Since then there has been a small core of protestors who have been disrupting HK's infrastructure - cross island tunnels, the subway, Central business district and now the airport. Many of the protests are violent, whether started by the police, protestors themselves, or sometimes groups of mysterious gangsters who are likely connected to local cronies of the Chinese Communists. The protestors don't have clear demands, and HK people are becoming fed up, and the continued protests are rapidly losing average people's goodwill.
Its time for the protestors to go home and organize themselves politically for the long struggle ahead against China.